
Changes the option and explicitely sets it for each desktopManager. Reasoning: Currently, services.xserver.displayManager.desktopManagerHandlesLidAndPower is set to true by default. This creates a problem for users without desktop environments activated, since lid management simply doesn't work (and they have to be lucky to find this option). See issue #9671
Each desktop manager should explicitly specify a value for `services.xserver.displayManager.desktopManagerHandlesLidAndPower`.